Good question, i have added in my book.

来源: 走马读人 于 2016-06-01 16:22:41 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (69 bytes)
回答: 请问英语有几种语调？ 由 gooog 于 2016-06-01 12:05:03

up, down hint meaning...   question /fact secret

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